Description
Separating funnel 250 ml pear-shaped (BF), graduated, with solid glass key NS 14,5/4 mm bore is engineered for efficient liquid–liquid extractions and phase separations at medium scale. Produced from borosilicate glass 3.3 conforming to ISO 4800, it delivers high chemical resistance and mechanical strength for demanding laboratory use. The pear-shaped body facilitates sharp phase interfaces and complete drainage, supported by clear graduation for volume assessment. A PE stopper on ground joint NS 29/32 ensures a tight seal during agitation. The solid glass stopcock with 4 mm bore allows rapid yet controlled discharge of the lower layer. This funnel from manufacturer Rettberg is supplied as one piece and is particularly suitable for preparative organic chemistry, solvent recovery, and larger sample work-ups. Its 250 ml capacity balances handling convenience with sufficient working volume, making it a versatile addition to research, industrial, and teaching laboratories that require durable, standardised separating glassware.
This article is part of Round-bottom flasks, in Beakers & flasks. See also Flat-bottom flasks.
Key features
- Pack size: 1 pc
- Nominal volume: 250 ml
- Shape: Pear-shaped (BF), graduated
- Stopcock: Solid glass key NS 14,5/4 mm bore
- Stopper: PE stopper NS 29/32
- Material: Borosilicate glass 3.3
- Technical Information Sheet:
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Questions about Separatory funnel, 250 ml, conical, grad., glass plug size 14,5/4 mm,
What is this article?
Separatory funnel, 250 ml, conical, grad., glass plug size 14,5/4 mm, is the article on this page. Luminix Health distributes Rettberg for laboratory use. It sits in Ballons à fond rond, inside Béchers & fioles, in Matériel de laboratoire.
A round-bottom flask is the heating flask of a distillation or a reflux. The curved wall takes the heat, and the ground neck connects to a still head or a condenser. The joint size, not only the volume, has to match the rest of the set.
A beaker is an open working vessel: easy to pour, poor as a measure. An Erlenmeyer flask has a flat base and a conical wall so a liquid can be swirled without climbing out. A round-bottom flask is for heating under a condenser, because the heat meets a curved wall and the joint at the neck connects to the rest of the glassware. Borosilicate is the glass that survives the temperature change. These forms are listed under ISO laboratory glassware.
Which category should I open next?
The category is Béchers & fioles. The sub-category is Ballons à fond rond. The catalogue is Matériel de laboratoire.
Shelves beside this one are Béchers, Fioles Erlenmeyer, Récipients de réaction & récipients à double enveloppe, Fioles à fond plat, Fioles (autres) and Accessoires pour béchers & fioles.
What should I check before I order?
When this page shows a safety data sheet, use that manufacturer file. Hazard text does not belong in the sales description. For a pack size, a grade or a certificate that is not on the page, send a quote request or contact the team.
How does ordering and shipping work?
Luminix Health distributes this article from the heart of Europe. Articles in stock ship within 2–5 business days. Standard delivery is free from €250 excl. VAT. Cold-chain goods and dangerous goods under ADR are never included in that free delivery. The terms are in the Shipping Policy. The full brand index is on shop by brand. Who we are is on about us.
Which other categories should I open?
The seven catalogues are Labware, Lab chemicals, Lab instruments, Lab consumables, Chromatography equipment, Lab safety equipment and Life Science & Microbiology.